Question

当我的手机连接到新的Wifi网络时，我正试图收到通知。

这是我BroadcastReceiver的逻辑：

@Override
public void onReceive(Context context, Intent intent) {
    if (intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
        Bundle extras = intent.getExtras();
        if (extras != null) {
            for (String key : extras.keySet()) {
                if(key.equals("networkInfo")){
                    NetworkInfo info = (NetworkInfo) extras.get(key);
                    if(info.getType() == ConnectivityManager.TYPE_WIFI){
                        if(info.getState().toString().equals("CONNECTED")){
                            //do stuff
                        }
                    }
                }
            }
        }
    }
}

当我打开Wifi并连接到新网络时，此功能正常。但我的问题是，当我已连接到Wifi网络然后连接到另一个网络时，没有任何反应。

为了实现这一目标，我应该向Actoin添加哪些IntentFilter权利？

修改

此代码工作正常。问题是WifiReceiver未注册。

Answer 1

请尝试此解决方案，

BroadcastReceiver broadcastReceiver = new WifiBroadcastReceiver();

IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);
context.registerReceiver(broadcastReceiver, intentFilter);

您需要检查路由器的MAC地址，以检查Wifi连接是否有变化。

public class WifiBroadcastReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (WifiManager.SUPPLICANT_STATE_CHANGED_ACTION .equals(action)) {
            SupplicantState state = intent.getParcelableExtra(WifiManager.EXTRA_NEW_STATE);
            if (SupplicantState.isValidState(state) 
                    && state == SupplicantState.COMPLETED) {
                boolean changed = checkWifiChanged();
            }
        }
    }

    /** Detect if WiFi is changed. */
    private boolean checkWifiChanged() {
        boolean changed = false;

        // You can store the previous MAC address in Shared Preferences and fetch it here
        String previousMacAddress = getPreviousMacAddress();

        WifiManager wifiManager = 
            (WifiManager) context.getSystemService(Context.WIFI_SERVICE);

        WifiInfo wifi = wifiManager.getConnectionInfo();
        if (wifi != null) {
            // Get current router MAC address
            String bssid = wifi.getBSSID();
            changed = !previousMacAddress.equals(bssid);
        }

        return changed;
    }
}

您可以将以前的MAC地址存储在数据库或共享首选项中，并检查新连接的MAC地址与前一个MAC地址。如果它们不同，则WiFi连接已更改，否则不会。

当连接到另一个wifi网络时，广播接收器会收到通知

1 个答案: